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Change-Id: I9a85a632059fad62a567946f3de19e7c11e5ead1 Implements: blueprint config-ref-rst
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Conductor
The nova-conductor service enables OpenStack to function
without compute nodes accessing the database. Conceptually, it
implements a new layer on top of nova-compute. It should
not be deployed on compute nodes, or else the security benefits of
removing database access from nova-compute are negated.
Just like other nova services such as nova-api or
nova-scheduler, it can be scaled horizontally. You can run
multiple instances of nova-conductor on different machines
as needed for scaling purposes.
The methods exposed by nova-conductor are relatively
simple methods used by nova-compute to offload its database
operations. Places where nova-compute previously performed
database access are now talking to nova-conductor. However,
we have plans in the medium to long term to move more and more of what
is currently in nova-compute up to the
nova-conductor layer. The Compute service will start to
look like a less intelligent slave service to
nova-conductor. The conductor service will implement long
running complex operations, ensuring forward progress and graceful error
handling. This will be especially beneficial for operations that cross
multiple compute nodes, such as migrations or resizes.
To customize the Conductor, use the configuration option
settings documented in the table nova-conductor.